Improvement in machines for tapping nuts



2 Sheets--Sheet l.

L. W. STOGKWELL. Machines for'Tapping Nuts.

Patented June 2,1874.

M\ Ji 52 L W. STOGKWELL. Machines for Tapping Nuts.

Patented June 2,1874.

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\N MM (/5 MMQ UNITED STATES PATENT @rrron.

LEVI \V. STOOKYVELL, OF RAVENNA, OHIO.

IMPROVEMENT IN MACHINES FOR TAPPING NUTS.

Specification forming part of Letters Patent No.-l5l,5l, dated June 2, 1874; application filed September 15, 1873.

To all whom it may concern:

Be it known that I, LEVI W. STOGKWELL, of Ravenn a, in the county of Portage and State of Ohio, have invented an Improved Nut-Tapping Machine, of which the following is a specification:

The principal feature of novelty is the manner of holding the nuts while they are being threaded by parallel jaws that are made to hold one or more nuts from turning while bein g threaded, and, at-the same time, are drawn back and caused to pass another nut on the tap, so that several nuts, not in contact with each other, are being threaded at the same time.

Figure 1 is a top view of the machine. Fi 2 is a section of the handle 1, arm 1), and lever 1'. Figs. 6, 7, and 8 illustrate the combination of the tap-holders, their cases, strut-levers, and seats. Fig. 3 is an end view of the nut-holder, Figs. 4. and 5 are sectional plans.

a is the frame of the machine. b is the driving-pulley on the hollow shaft 0. The tapholders m m and m are in the head at the front end of the hollow shaft. The cases 0 c 0 move in grooves in the head. The tap-holders are held in the cases by pins through them, which are kept from slipping out by the sides of the grooves in the head. Around the head, and revolving with it, is the sliding collar f, which is made to slide on the head to open and close the tap-holders for the purpose of holdin g and releasing the tap. The sliding collaris surrounded by the reciprocating ring, g, which moves with the collar, and has as many cams as there are tap-holders. The cases 0 c e are connected with the ring g by the strut-levers i i i and the lever-seats s s s. Flanges on the lever-seats enter the cam grooves h h h in the ring 9, so that when the ring is turned on the collar the lever-seats, strut-levers, cases, and tap-holders are moved toward or from the center of the head, and thus the tap-holders are adjusted to different-sized taps. The outer ends of the strut-levers turn in the seats and the inner ends in the cases. The forms of the levers, seats, and cases are shown in Figs. 6, 7, and 8, and the tap-holders in Figs. 4 and 5, and also the manner in which they are combined. There is a vernier scale on the circumference of the ring g and a corresponding scale adjoining it on the sliding collar f, which are marked with letters or figures to indicate the adjustment of the tap-holders. The scales are shown, but not marked with letters or figures, in Fig. 1. Grooves for the cases and seats are cut in the head and in the sliding collar. The face-plate 7; is screwed fast to the front of the sliding collar to hold the ring 9 and the seats, so that they may be moved by the collar in opening and closing the tap-holders. The collar is made to slide on the head by the lover I, which is pivoted on opposite sides of the collar, at the top and bottom, to the ring m, which rests in a groove around the collar, and in which the collar revolves. The lever I has its fulcrum in the link a, attached to the frame of the machine. The arm 19 is attached to the frame and passes through a slot in lever land supports the handle of the lever. A spring fastened to the arm 1) passes through the slot in lever l and presses against the end of the small lever T, which is pivoted in the slot. The lever a has a notch near its end in the slot for the end of the spring to catch against and hold lever I when the lever l is moved forward to close the tap holders against the tap. hen the handle of lever 1" is pressed toward the handle of lever l the end of lever 4" presses the spring out of the notch, and then the spiral spring c draws back lever I, which opens the tap-holders and releases the tap. One end of the spiral spring c is attached to the arm 1) and the other end to lever l. 'The combination which enter a groove in the cap.

The arrangement and operation of parts, which I shall now describe, are illustrated in Figs. 4 and 5.

The tap-holder on has the screw-pin m pass ing through it and projecting from its inner end through a hole in the socket 0 into the shank of the tap to hold the tap in the socket. The inner end of the tap-holder m enters a groove in one side of the socket, and the other tap-holders m m press against the other side of the socket, and thus it and the tap are caused to revolve with the head. Fig. 4; is a sectional view of the tap-holder m the socket 0 and a partly-sectional view of the nut-adjuster 0 Fig. 5 is a view of the head with the cap I) and the face-plate 7c removed, and containing the tap-holders and socket. Differentsized sockets are used for differentsized taps. To remove the tap and socket the tap-holders are opened by means of the lever luntil the screw-pin through the tap-holder m is drawn out of the socket; but when it is only required to take out the tap, remove the threaded nuts from it and replace it, then, by means of a stop-pin through the arm 19, back of the lever l, the tap-holders are permitted to open only enough to remove the screw m from the tap, but not from the socket. The nutadjuster 0 has a rod or pin projecting from it horizontally beneath the axis of the tap, for the purpose of holding different-sized n'uts, so that the center of the nut is always in line with the axis of the tap. The manner of its operation is shown in Fig. 3. Its sides or edges rest on two pins, one in each side of the vice, and are at an angle of forty-five degrees to the top, which is horizontal, thus causing it, when the vise-jaws are being closed, to rise as fast as each jaw moves toward the other. It is guided by its lower end passing through a hole in the frame in which the sides of the vise move. The sides of the vise are opened and closed by right and left hand screws, which are turned by a hand-wheel.

The vise with its frame is moved to and from the head in the ordinary manner by means of toothed wheels turning on ways in the frame of the machine, turned by a hand-wheel. On the inner sides of the vise are grooves, in which are held the parallel jaws 0 0 one on each side of the tap, only one of which is shown in Fig. 4. The parallel jaws with the nut-adjuster form three sides of a box for holding the nuts while they are being threaded. The

back ends of the parallel jaws near the nutadjuster project toward each other at right angles to the tap, so that when the vise is moved toward the head they press the nut, which is placed in front of them on the thread of the tap, and prevent the nut from turning. lVhen the thread of the nut is partly formed the vise may be drawn back and another nut be placed on the nut-adjuster and pressed on the thread of the tap at the same time that the former nut is being threaded.

Some of the principal parts of this machine which relate to the threading of bolts and to cutting off gas-pipe, are described and claimed in my applications for a bolt-threading machine, and for a gas-pipe-fitting machine.

The nut-adjuster o difi'ers from the similar device described in my application fora boltthreading machine, by having the rod or pin hereinbefore described, for the purpose of holdin g the nuts. The parallel jaws 0 0 difl'er from the similar device in my bolt-threading machine above referred to, by their back ends projecting toward each other, as described, and by having their faces smooth for the nuts to slide against, and also by being made long enough to hold nuts till they leave the thread of the tap, while another nut is being placed between them in position to be tapped.

I claim as my invention-- 1. The combination of the tap-holders m m m with the screw-pin, the socket 0, and the tap, substantially as and for the purpose herein set forth.

2. The combination of the socket 0, the tapholders m m m, the cases 0 e e, the strut- .levers i i i, the seats 8 s s, and the ring g, substantially as and for the purpose herein set forth.

3. The parallel jaws 0 0 in combination with the two sides of the vise and the nut-adjuster 0 substantially as and for the purpose herein set forth.

LEVI W. STOCKYVE LL. 

